Demonstrates programmatic use of Py4J script engine within an Eclipse plug-in thanks to EASE.

Greeting.java

/**
 * Greets people.
 */
public class Greeting {

	private String name;

	public void setName(String name) {
		this.name = name;
	}

	public String getName() {
		return name;
	}

	public void greet() {
		System.out.println("Hello " + name + "!");
	}
}

GreetingInPython.java

import java.util.List;

import org.eclipse.ease.IScriptEngine;
import org.eclipse.ease.service.EngineDescription;
import org.eclipse.ease.service.IScriptService;
import org.eclipse.ui.PlatformUI;

/**
 * Greets people using a Java Greeting instance from Python.
 *
 * <h3>Example of Use</h3>
 * 
 * The following examples prints "Hello Lorem!" then "Hello Ipsum!":
 * 
 * <pre>
 * List<String> names = Arrays.asList("Lorem", "Ipsum");
 * 
 * GreetingInPython greeting = new GreetingInPython();
 * greeting.greet(names);
 * </pre>
 *
 * <h3>Dependencies</h3>
 * 
 * Requires following dependencies in MANIFEST.MF:
 * <ul>
 *  <li>org.eclipse.ui,</li>
 *  <li>org.eclipse.ease</li>
 * </ul>
 *
 * Following plug-ins should be available as well (within Eclipse or via target
 * platform):
 * <ul>
 *  <li>org.eclipse.ease.lang.python,</li>
 *  <li>org.eclipse.ease.lang.python.py4j</li>
 * </ul>
 */
public class GreetingInPython {

	public void greet(List<String> names) {
		// Retrieve the engine aimed to execute Python's code
		final IScriptService scriptService = PlatformUI.getWorkbench().getService(IScriptService.class);
		EngineDescription engineDescription = scriptService.getEngineByID("org.eclipse.ease.lang.python.py4j.engine");
		IScriptEngine engine = engineDescription.createEngine();

		// Create a new Greeting instance and make it available from Python
		Greeting greet = new Greeting();
		engine.setVariable("greeting", greet);

		// Make the list of the names to greet available from Python
		engine.setVariable("names", names);

		try {
			// Execute Python code
			engine.executeSync(
				"for name in names:\n" + 
				"  greeting.setName(name)\n" + 
				"  greeting.greet()"
			);

		} catch (InterruptedException e) {
			e.printStackTrace();
			Thread.currentThread().interrupt();
		}
	}

}